fail to clean pseudo header when window scroll but cursor not moved

[ipod825]

For example, in any non-empty directory, keep pressing <C-f> till the end and then press <C-b>. We'll see the pseudo header remain there.

Since there's no window scroll event in vim, there seems to be no better solution other than remap all <C-f>, <C-b>, <C-d>, <C-u>, <C-e>, <C-y> (which I definitely won't do so).

[ipod825]

Related issues: https://github.com/neovim/neovim/issues/8854